Add missing checkmark icons (#4070)
Add missing checkmark icons (#4070)


switch-education/pxt,switchinnovations/pxt,Microsoft/pxt,switch-education/pxt,playi/pxt,switchinnovations/pxt,switch-education/pxt,switch-education/pxt,switch-education/pxt,playi/pxt,Microsoft/pxt,Microsoft/pxt,Microsoft/pxt,playi/pxt,switchinnovations/pxt,playi/pxt,switchinnovations/pxt,Microsoft/pxt